One senior NATO military official told CNN there have definitely been movements of heavy weapons around Sarajevo, but that its difficult to be sure that the weapons are far enough away from the city to no longer be a threat.

CNN: Waiting for morning

Professor Shaman cautions that the link is far from being firm enough that it could be used as a tool to forecast pandemics.

BBC: La Nina 'linked' to flu pandemics

For all the charges and counter-charges, it's far from clear that all of Bradley's tough talk will be enough to deny Gore a series of important victories in the March 7 Democratic presidential primaries.

CNN: Stuart Rothenberg: Bradley and Gore slam each other at the Apollo

It is impossible to say with certainty how bad the 21st century's heating will be, but there is a large chance of it getting hot enough to do harm, and a far from trivial chance of things turning catastrophic.

ECONOMIST: Climate controversies